| photochemical | <chemistry> Of or pertaining to chemical action of light, or produced by it; as, the photochemical changes of the visual purple of the retina. Origin: Photo- + chemical. Source: Websters Dictionary (01 Mar 1998) |
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| oxidants, photochemical | Compounds that accept electrons in an oxidation-reduction reaction. The reaction is induced by or accelerated by exposure to electromagnetic radiation in the spectrum of visible or ultraviolet light. (12 Dec 1998) |
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| photochemical |
of or relating to or produced by the effects of light on chemical systems
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| photochemical reaction |
a chemical reaction produced by the action of light
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| photochemical |
Type of air pollution characterized by high levels of ozone and low visibility, typically found in cities located in a valley (eg, Los Angeles, Denver, Mexico City). Sunlight, oxides of nitrogen, and hydrocarbons (the latter two of which arise from automobile exhaust) are all required in order for smog formation to occur. The most severe episodes occur when a strong temperature inversion caps the location and traps the pollutants. ...
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| photochemical smog |
Air contaminated with ozone, nitrogen oxides, and hydrocarbons, with or without natural fog being present. In the presence of sunlight, hydrocarbons and NO x are involved in a complex series of chemical reactions that eventually creates ozone and other oxidants as secondary pollutants. However, ozone is also destroyed by NO x . ...
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| photochemical reaction |
A chemical reaction that involves either the absorption or emission of radiation. The absorption of an ultraviolet photon often provides the energy required to break chemical bonds and initiate a reaction sequence. Examples of photochemical reactions are the photolysis of nitrogen dioxide, NO 2 NO + O, or ozone, O 3 O 2 + O. The latter reaction leads to the initiation of chain reactions that cause the breakdown of hydrocarbons and other pollutants in the troposphere. ...
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| photochemical | of or relating to or produced by the effects of light on chemical systems |
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| photochemical | an exchange produced by the chemical action of radiant energy (especially light) |
| photochemical | a chemical reaction produced by the action of light |
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